Auger-bit.



JAMES THOMAS PARKER, OF HATTIESBURG, MISSISSIPPI.

AUGER-BIT.

Specification of Letters Patent.

Patented April 16, 1907.

Application iled October Z0, 1906. Serial No. 339,875.

To all whom t may concern:

Be it known that I, JAMES THOMAS PARKER, a citizen of the United States, residing at Hattiesburg, in the county of Perry and State of Mississippi, have invented a new and useful Auger-Bit, of which the following is a specification.

This invention relates to auger-bits; and its object is to provide a bit of this character which has an adjustable cutter, whereby the diameter of the bore may be of' any desired size.

The device is more particularly designed as an improvement upon the bit described and claimed in Patent No. 825,479, which was granted to me on July 10, 1906.

The object of the present invention is to simplify the present construction and to provide .durable and compact means for locking the adjustable cutter in desired position, said means being capable of easy manipulation.

With these and other objects in view the invention consists of. certain novel features of construction and combinations of parts, which will be hereinafter more -fully described, and pointed out in the claims.

In the accompanying drawings is shown the preferred form of the invention.

In said drawings, Figure 1 is a perspective view of the auger-bit, a portion of the housing of the plunger being broken away. Fig. 2 is a longitudinal section through the bit, and Fig. 8 is a transverse section therethrough on line x of Fig. 2,.

Referring to the figures by characters of reference, 1 is the shank of a bit, the same having an enlarged head 2, substantially semicylindrical in form and terminating in a cutting-head 3, from which extends a screw 4. Brazed upon or formed integral with the fiat face of the head 2 is a housing 5, having a transverse passage 6 therethrough, which communicates'with a longitudinal passage 7 The housing is preferably beveled toward the shank l, as shown at 8, while that end of the housing adjacent the cutting-head 3 is reduced to form a base 9, in which is produced a transversely-extending dovetailed groove 10. A cutting-blade 11 is slidably mounted on the base 9 and has a beveled cutting edge which overlaps the head 3, and the inner face of this cutting-blade is fiat, so as to fit firmly upon the base 9. A dovetailed tongue 12 is formed upon the flat face of the cutting-blade and is slidably mounted within the groove 10. An arm 13 extends at right angles from one endof the cuttingblade and has a rack 14 formed integral therewith and extending at right angles therefrom, said rack being slidably mounted within the passage 6 and the toothed portion 'l5-thereof being beveled, as shownparticularly in Figs. 1 and 2. This toothed portion is adapted to be engaged by the toothed beveled end 16 of a plunger 17, which is slidably mounted in the passage 7 and has an integral hook 18 at its outer end, which engages a circular ange 19, formed upon an. eccentric 20, rotatably mounted on a pivot 21, connected to the shank 1. An arm 22 extends from the eccentric, so as. to enable it to be readily manipulated.

- When it is desired to adjust this auger-bit so as to produce a bore of large diameter, the arm 22 is swung so as to cause the eccentricallyarranged flange 19 to pull longitudinally on plunger 17 and withdraw it from engagement with the teeth l5. The rack 14 can then be slid longitudinally, so as to move the cutting-blade laterally and bring the front or advancing edge thereof at a desired distance from the longitudinal center of the bit. When the desired adjustment has been secured, the eccentric is again partly rotated,

,so as to force the plunger longitudinally into engagement with the rack, whereupon the parts will be securely locked in place. As the rack is beveled and as that end of the plunger engaging it is also beveled, it will be understood that the end of the plunger constitutes a wedge, which not only engages therack, but wedges between the housing and rack, so as to force the rack against the shank and hold it thereagainst. The eccentric will be held in position after adjustment by reason of its frictional contact with the hook 18.

It will be seen that by constructing thev bit in the manner described the parts are compactly arranged and cannot be forced out of positionafter an adjustment has once been effected. The cutting-blade is rigidly connected to the head of the bit and no oscillation thereof is permitted when the partshave once been secured.

The preferred form of the invention has been set forth in the foregoing description; but I do not limit myself thereto, as I am aware that modiications may be made therein without departing from the spirit or sacri- ICO IIO

icing the advantages thereof, and I therefore `reserve the right to make such changes as plunger slidably mounted Within the longitudinal passage and having a beveled toothed end constituting a Wedge for engaging the rack, and means upon the shank for moving the end of the plunger into engagement With the rack and for Wedging said end between the housing and rack.

2. In an auger-bit the combination With a shank having a head at one end thereof, and a housing upon the shank.; of a cutting-blade` i extending transversely of the shank, an integral portion upon the blade and movable transversely Within the housing, said portion having a beveled face, a plunger slidably mounted Within the housing and having a beveled end constituting a Wedge, and means for actuating the plunger to force this beveled end between the housing and the beveled face of said integralportion to bind said portion to the shank.

3. An auger-bit'comprising a shank having a cutting-head, a housing adjacent the cutting-head and having communicating transverse and longitudinal passages, one end of said housing being reduced and havin a dovetailed groove, a cutting-blade slidaly mounted on the reduced portion of the housing, a tongue thereon Within and engaging the Walls of the groove, a rack integral With the outting-blade and slidably mounted Within the transverse passage, a plunger in the longitudinal passage, an eccentric movably mounted on the shank for shifting the plunger into or out ofengagement with the rack.

4. An auger-bit comprising a shank having a cutting-head, a housing adjacent the cutting-head and having communicating transverse and longitudinal passages, one end of said housing being reduced and havin a dovetailed groove, a cutting-blade slidaly mounted on the reduced portion of the housing, a tongue thereon4 Within and engaging the Walls of' the groove, a rack integral With the cuttingblade and slidably mounted Within the transverse passage, said rack having a beveled toothed portion, a plunger slidably mounted Within the longitudinal passage and having a beveled toothed portion, and an eccentric upon the shank for moving the plunger into or out of engagement With the rack.

In testimony that I claim the foregoing as my oWn I have hereto affixed my signature in the presence of tWo Witnesses.

JAMES THOMAS PARKER.

Witnesses:

J. B. MOFFETT, Jr., B. S. HOWELL. 

